Figure 9 - uploaded by Craig A. Boys
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Different types of water-control structures typically used in the irrigation industry to regulate flow. O = overshot, U = undershot. a) radial (O), b) undershot sluice (U), layflat (O), d) drop-board (O), e) and f) combination leaf gate (O or U). Photos courtesy of AWMA Water Control Structures.
Source publication
Irrigated agriculture is vital for the food security and prosperity of
people in large river basins like the Murray-Darling and Mekong.
Irrigation requires water-control structures in rivers, such as weirs,
sluices and regulators. Many of these structures can have negative
impacts on fish. However, these impacts can be reduced if structures
are des...
Contexts in source publication
Context 1
... industry was consulted (AWMA Water Control Structures) and a desktop review was conducted to identify the main types of water-control structures typically used in the irrigation industry to regulate flows. While there are a variety of manually or automated gate and weir structures available (including drop-board structures, radial gates, combination leaf gates, layflat gates and undershot sluice gates: Figure 9), generally the technologies can be divided into one of two main types: those that release water underneath a gate and those that release water over the top. Hereafter these will be referred to as undershot and overshot structures (Figure 10). ...
Context 2
... that the fishway trapping has been going for many more years than the downstream trapping, it would be expected to see very similar numbers of species seeking return passage to the Mekong when compared to those moving upstream into the wetland. This is supported by our observation that the vast majority of species and individuals trapped passing the regulator can be classed as belonging to the 'grey fish' guild ( Figure 29). That is, they are generally known to undertake short migrations between floodplains and the main channel. ...
Context 3
... project workshops and meetings -These have been an important way to disseminate research findings to those who will use the knowledge. The final project workshop held in Pak San in September 2019 was a prime example (Figure 39) Figure 40). During these visits it was clear that discussions that were had at the demonstration site helped solidify and clarify what was being taught in theory indoors. ...
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